Fluid-motor.



E. J. FIRTH.

FLUID MOTOR.

APPLIOATION rum) my 1a, 1908.

91 7,034. 7 Patented Apr. 6, 1909.

2 SHEETS-SHEET 1.

Witnesses.-

E. J. FIRTH.

, FLUID MOTOR. APPLICATION FILED MAY 18, 1908.

917,034. Patented Apr. 6, 1909.

2 SHEETS-SHEET 2.

Witnesses.-

FA 8 to EDWARD J. FIRTH, OF DELHI, OHIO,

FLUID-MOTOR.

Specification of Letters Patent.

Patented April 6, 1909.

Application filed May 18, 1908. Serial No. 433,401.

To all whom it may concern:

Be it known that I, EDWARD J. FIRTH, a citizen of the United States, residing at Delhi, in the county of Hamilton and State of Ohio, have invented. certain new and useful Improvements in Fluid-lviotors, of which the following is a specification.

My invention relates to fluid motors, and its object is to simplify the construction and increase the eificiency of operation of apparatus of that character.

My invention consists in a casing of hemispherical formation, in which is inclosed a hollow piston having a surface conforming to the interior of the casing and rigidly mounted on a shaft journaled axially of the casing, the shaft being adapted to conduct the fluid to and from the hollow piston and to impart alternating rotary motion, and the piston being provided with inlet and outlet valves.

My invention also consists in the parts and in the combination and arrangement of parts as will hereinafter be more fully described and claimed.

In the drawing: Figure 1 is a plan view of a device embodying my invention. Fig. 2 is a vertical sectional elevation on a line corresponding to sc-w of 1. Fig. 3 is a cross section on a line corresponding to yy of Fig. 4, and Fig. is a front elevation of the device. Fig. 5 is a detail, in front elevation, of the rear section of the casing. Fig. 6 is a detail, in rear elevation, of the front hemispherical section of the casing. 7 is a detail, in front elevation, of the hollow piston and part of the shaft thereon. Fig. 8 is a detail of the bushing for the inlet valve. Fig. 9 is a detail of one of the sections of the inlet valve. Fig. 10 is a detail of one of the sections of the outlet valve. Fig. 11 is a longitudinal section througl'i the inlet valve. Fig. 12 is a longitudinal section through the outlet valve.

As illustrated, the casing comprises the front hemispherical section 1 provided with flanges 2, to which is bolted, by means of its flanges 3, the rear section 4, the line of juncture 5 of the two sections being axial of the hemispherical section 1. Parallel with the plane of the line of juncture 5, the shaft 6 is journaled in bearings 7 and 8, formed in the casing sections 1 and 4. This shaft has,

preferably, formed integral with it, the hollow piston 9. This piston 9 has its free edge conforming to the interior surface of the hemispherical section 1 of the casing, and internally is divided by the partition 10 into two compartments 11 and. 12. The shaft 6 is provided with a passage 13 leading from the compartment 11 to the end of the shaft, this passage 13 forming the inlet for the 'fluid to the motor. The shaft 6 is provided with a passage 14, leading from the compartment 12, to communicate with the outlet for the fluid from the motor.

The rear section 4 of the casing is provided with a partition 15 extending across it and dividing it into two distinct parts 16 and. 17, this partition extending parallel to the shaft 6 and being adapted, by means of a suitable packing 18, in contact with the shaft 6, to form a joint therewith to prevent the passage of the fluid from one part of the section 4 to the other part. Similarly the part of the hollow piston 9, which conforms to the interior surface of the hemispherical section 1 of the casing, is provided with a suitable packing 19, by means of which the hollow piston is adapted to form a joint with the interior surface of the hemispherical section 1 of the casing. Thus, by means of the joints formed between the packing of the partition 15 and the shaft 6, and between the packing of the piston 9 with the interior surface of the hemispherical section 1 of the casing, the entire casing, constituted by the front hemispherical section 1 and the rear section 4 joined together, is divided into two distinct compartments 16 and 17 continuous with the parts 16 and 17, respectively, of the section 4 of the casing. these compartments will be varied by the reciprocation of the hollow piston 9.

he compartment 11 of the hollow piston 9 communicates with both of the compartments 16 and 17 through openings 20 and 21, respectively, in its walls, while the compartment 12 also communicates with both the compartments 16 and 17 through openings 22 and 23, respectively, in its Walls. The openings 20 and 21 in the walls of the compartment 11 are in alinement, and the opening 21 is of somewhat greater diameter than that of the opening 20 to permit of the The relative size of sira le.

insertion of the inlet valve 24. The opening 21 is provided with a bushing 21*, and the inlet valve is adaptedtoslideinthe Opening 20 and in the bushing 21*, and has seats, 25 and 26, on the interior of the wall of the compartment 11 around the opening 20, and on the interior end of the bushing 21, respectively. The openings 22 and 23 in the walls of the compartment 12 are also in alinement, and mounted in these openings is the outlet valve 27, having seats 28 and 29 on the exterior of the walls of the compartment 12. Thus constructed, when water or other fluid is admitted into the compartment 11 of the piston 9 through the passage 13 in the shaft 6, the fluid will pass outward into one of the compartments of the casing as into the compartment 17 illustrated in Fig. 1 of the drawing, where the solid arrow indicates the direction of the fluid through the opening in the wall of the compartment 11 of the piston 9. The fluid being under sufficient pressure to overcome resistance of the. turning of the shaft 6, the piston will be forced around the casing in the direction of the outlined arrow in Fig. 1 of the drawing, during which operation the compartment 17 a is increased in size, while the compartment 16' is correspondingly decreased in size. At the same time, any fluid which is in the compartment 16 will be forced out due to the decrease in size in the compartment through the opening which leads from the compartment 16 to the interior of the compartment 12 of the piston 9, and through the passa e 14 in the shaft 6 from which it is exhaustec As soon as the piston 9 has been forced in the direction which it has taken sufliciently far for the ends of the valves 24 and 27 to strike the wall formed by the flat interior surface of the rear section 4 of the casing, the positions of the valves 24 and 27 will be changed, and the water, or other fluid entering through the passage 13 in the shaft 6 to the compartment 11 of the piston 9, will flow through the opening in the wall of the compartment into the compartment 16, forcing the piston 9 in the opposite direction, while the valve 27, being also reversed, the fluid in the compartment 17 will be allowed to flow out through the opening in the wall of the compartment 12 and be exhausted therefrom through. the passage 14 in the shaft 16.

The operations above described will alternate continuously during the supply of fluid under pressure, and will cause reciprocation of the shaft 6, which may be utilized for any pur ose where this form of motion is de- As illustrated the valves 24 and 27 are constructed in separate sections 24 and 24 and 27 and 27 respectively, slidably mounted on pins 24 and 27 respectively,

and interposed between the sections of the valves are springs 24 and 27 respectively. These ,springsare employed in order to cause the valves to act quickly and secure economy in the use of the fluid after the manner of valves in general. It will be understood that these valves may be of solid construction where such economy is not especially desired. As the shaft 6 reciprocates, while it is desired that the supply tube 30 be stationary, a swivel connection 31 of well known construction is provided. As illustrated, the outlet from the shaft 6 is constructed in a different manner consisting, as it does, in providing in the p arts of the casing surrounding the shaft in the region of the end of the passage 14, a chamber 32, from which chamber the outlet tube 33 leads, being connected therewith by means of a nipple 34. The shaft 6 has an opening 35 which com.- municates between the passage 14 in the shaft 6 and the chamber 32.

For the purpose of preventing leakage, a stuffing box 36 is provided around the shaft 6 in the bearing 7, while a similar stuffing box 37 is provided around the shaft 6 in the hearing 8, and a third stufiing box 38 is provided around the shaft 6 in its bearing in the casing between the piston 9 and the chamber 82. In this connection it will be understood that the construction of the outlet may be applied in constructing the inlet to the motor, or, if found practicable, the swivel connection 31 might be substituted for the construction of the outlet herein illustrated. However, the construction of the outlet herein illustrated is best adapted to my improved motor, since it leaves the end of the shaft 6 free for the application of a coupling or other ap aratus to transmit the power developed by the motor, and should it be desired to leave both ends of the shaft 6 free for this purpose, it will be understood that the construction of the outlet herein illustrated would be most desirable for the construction of the inlet.

As herein illustrated, the motor is provided with a suitable base 39 which may be secured to'the frame-work or casing of the machine to which the motor is to be applied, and forms a rigid support for the motor.

Having fully described my invention, what I claim as new and. desire to secure by Letters Patent, is:

In a fluid motor, a casing comprising a front section of hemispherical formation and a rear section, secured together, a shaft journaled between the casing sections parallel to the joint between the sections, a p artition in the rear section forming a joint with the shaft, a hollow piston rigidly mounted on the shaft and having a surface conforming to the interior of the hemispherical casing section, the hollow piston having separate compartments and the shaft having a passage adapted to conduct fluid to one of the compartments of the piston, and another passage adapted to conduct fluid from the other compartment of the piston, an inlet valve in one of the compartments of the piston, and an outlet valve in the other of 1 EDWARD J. FIRTH.

Witnesses GEORGE SIEFFERMAN, E. E. KIRKPATRICK.

l the compartments of the piston, substantially v as and for the purposes hereinset forth. 

